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Joined: Jul 2001
Posts: 803
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Since my cats are plugged and I can't top 140kph/84mph how much HP is my engine likely producing? Seeing as I had a 86 626 with 93HP that was boxier able to do 184kph/112mph I was curious how much power I'll get back with my precats being replaced?  :p 
hunter green 96 mystique mtx, sabb side markers deep tints
car bra., K & N filter, hyper white low beams, after market fogs, JVC Kameleon head unit, 600 watt amp with 2 10" kicker subs, soon to come new rims
New adition 01/11/2002 The original 95SE in Midnight Red all the toys including traction control
Fog light mod, lightmoonroof switch from a focus, power antena (still wiring it up) post 98 sail panels, new water pump , Bosch quad plaitnum plugs, and a new Cat.
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Joined: Apr 2002
Posts: 378
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This is in no way true, but lets say the fraction is 93HP produces 112mph. So 93 * a = 112...so a = 112/93. So hp * (112/93) = 84...so using your '86 626 fraction your motor is currently making about 70HP. So if a stock Zetec is at 125 your car should be making, with the MTX, like 105HP. So using your fraction again, you should be able to go 126MPH without the speed limiter. Which is pretty damn close to how fast a Zetec will go.
So you can very roughly approximate your car now at around 70HP.
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Joined: Jul 2000
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The worst thing you can do to that car is run it hard at WOT with plugged cats. You are begging for a blown head gasket.
Replace them, gut them, or blow your motor. It's that simple.
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Joined: Aug 2001
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how can you tell if your cats) are(or in my case cat is) plugged?
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Joined: May 2002
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From what I can tell,,, you'll know when your cats are bad. Normally they scratch and bite a lot. Will going real fast make cats fail quicker?
"Wow, that sank fast." "Yeah, like a rock." 96 Contour GL ATX 9mm Ford Racing Wires; 2 Resonators down, 1 to go;"Special airbox"; many mods planned Sony CD player: 50wattsx4;remote; Speakers=50 watt Pioneer 6x8s Ross Evans 
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Joined: Apr 2002
Posts: 165
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No Joke!!!!! Black flag that one and replace the cats quick! You only do more harm than good trying to drive it with bad cats! Put it this way....The night I found out my 84 cavalier's cat was bad, I called dad to ask why was my exhaust manifold GLOWING RED!!!!
Driving fast??? Depends. How much RPM are you turning? Think about this. A cat hardcore metals in it. I forget the main one and the reason why cats are expensive. The reason a cat gets "clogged", as it was explained to me, is that the metals melt and then restrict the airflow causing it to clog. Do I think that hardcore driving will lead to cats failing? Maybe, maybe not, but down the road they may cause them to fail a little earlier than normal. But this can be said of anything that fails early.
L8R
Rich
'96 Mystique, Zetec, MTX.
---Mods---
Removed both intake resonators and airbox. Installed APC air filter and APC crankcase ventilation filter. Removed exhaust resonator.
Installed XM Satellite Radio. Replaced bad alternator and 175a fusible link...much fun!
Intake plenum---GONE!!!!
My car growls louder than yours.
If I can't buy it, I'll build it...Trust Me!!!!
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